Monospace has built in internal sync (Pro package only) that lets you keep all your devices on the latest version's of your notes, and let's you edit anywhere.

Monospace Writer's hashtags feature replace the classic folder system. Simply add hashtags (which can be nested) to the last line of a file and Monospace will take care of the file/folder organisation for you.

Monospace Writer allows for exporting via Markdown, meaning it has copy and paste support for a huge amount of services, including Wordpress and Tumblr.